Rotary knob



FIG. 1 is a front view of the rotary knob according to my design;

FIG. 2 is a left view of the rotary knob of FIG. 1 ;

FIG. 3 is a right view of the rotary knob of FIG. 1 ;

FIG. 4 is a top view of the rotary knob of FIG. 1 ; and,

FIG. 5 is a bottom view of the rotary knob of FIG. 1 .

The broken lines in the Figures depict portions of the rotary knob that form no part of the claimed design. 

CLAIM The ornamental design for a rotary knob, as shown and described. 